As i developed javascript and Ajax Applications in the last year i have use several really good tools that helped me with a fast and clean development of code. Some of them ill name here and now.

Firefox Browser
The Firefox Browser is the best browser for developers and is needed for most of the tools and plugins described here. Its standard compilant, so if youre developing for xbrowser compatible Apps, you better start with firefox comapt and the move towards InternetExplorer
get Firefox here

Fire Bug
Shipped as a Plugin for Firefox, firebug helps you look into your application, some features:

• Status bar icon shows you when there is an error in a web page
• A console that shows errors from JavaScript and CSS
• Log messages from JavaScript in your web page to the console (bye bye "alert debugging")
• An JavaScript command line (no more "javascript:" in the URL bar)
• Spy on XMLHttpRequest traffic
• Inspect HTML source, computed style, events, layout and the DOM

A Must have if you code javascript and like to know what you Application is doing NOW ;)
get Firebug Here

Web Developer Toolbar
Shares some Features with firebug, but most of them are unique. This toolbar has the following Features

• cookies, ( view, edit, delete)
  
• css (disable, inplace edit, borders around boxes)
  
• forms (copletition, show form vars, convert to get / post)
• images (disable, infos etc)
  
• informations on all elements on the page
  
• outline elements
• zoom in and out
  
  

I guess i saved miriads of time since i use that one
get the Tolbar here

Selenium IDE Webtester
Tired of doing all the same click and test workflow all the day ? Wanna concentrate on coding ? Usethe Seleium IDE to record ypour clicks on the Application and replay whenever you need them ...

Links
OpenQA
Selenium IDE
Driven selenium reference
Story about Selenium

JSeclipse by Interakt
No need to say more than the homepage stats, its simply the best js editor i have stumeled upon:

JSEclipse is the the best and most popular Javascript plugin for the Eclipse environment. Its benefits are visible from the simplest tasks like editing small sections of code for your site to the more complex ones like working with the next big AJAX library or developing plugins for a product that embeds JavaScript like Dreamweaver or Photoshop.

get JSEclipse


So have fun and get to the sun instead of using the wrong tools and waste time ;)

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